16 results about "Polydiacetylenes" patented technology

The invention discloses a reversible thermochromic polydiacetylene material and application thereof in medium-high temperature overheat monitoring, the material is an amide functionalized conjugated polymer containing polydiacetylene on both sides, and the preparation method comprises the following steps: a) reacting 10, 12-pentacosadiynoic acid with an amine compound to synthesize an amidated conjugated diacetylene monomer; and b) carrying out in-situ topological chemical polymerization on the diacetylene monomer under the irradiation of ultraviolet light to obtain the polydiacetylene material. The polydiacetylene material shows a remarkable thermochromic characteristic under thermal stimulation, the color of the polydiacetylene material changes in multiple steps at different temperature critical points, after the polydiacetylene material is cooled to the room temperature, the color of a polymer is rapidly restored, and the color change of the material is stable through multiple heating and cooling cycle experiments. The material can repeatedly monitor the real-time temperature of various electric appliances or equipment, and overheating after long-time use is avoided.

The invention discloses a copper porphyrin conjugated acetylene polymer composite material, a preparation method and application of the copper porphyrin conjugated acetylene polymer composite material in biological mercaptan photoelectric detection, the composite material comprises an electrochemical reduction graphene oxide layer, a poly (1, 4-diacetylene benzene) layer and a copper porphyrin conjugated acetylene copolymer layer, and the three layers form a layered composite structure through pi-pi interaction. The copper porphyrin conjugated acetylene copolymer is formed by copolymerization of a 1, 4-diacetylene benzene monomer and a copper-coordinated 5, 10, 15, 20-tetra (4-acetylene phenyl) porphyrin monomer through a Sonogashira coupling reaction, and the composite material utilizes a double recognition site mechanism that a Cu-S coordinate bond is formed by a porphyrin center and sulfydryl and an acetylene bond and the sulfydryl are subjected to a click reaction under illumination. The high-sensitivity and high-selectivity detection on the L-cysteine and the reduced glutathione is realized, and the detection limit on the L-cysteine can reach 2.3 mu M.

This invention relates to a dual-responsive poly(diacetylene) hybrid nanozyme, its preparation, and its application, belonging to the field of pharmaceutical technology. The dual-responsive poly(diacetylene) hybrid nanozyme of this invention uses poly(4,6-diynyl sebacate) as a template polymer, wherein a metal oxide with Fenton-like catalytic activity is complexed and linked to the carboxyl group of the template polymer. The dual-responsiveness of the nanozyme to pH and reactive oxygen species in this invention enables the hybrid nanozyme to exhibit precisely regulated catalytic activity. In an acidic environment, the protonation of PDDA induces the nanozyme to self-assemble into fibrous aggregates, significantly enhancing its retention capacity in the stomach (especially at sites of inflammation). Acidic pH and elevated hydrogen peroxide levels jointly activate the catalytic antibacterial activity of the nanozyme, thereby achieving antibacterial and antitumor effects.

The invention discloses a polymer conversion wave-absorbing ceramic constructed by a cross-linking strategy, and a preparation method and application thereof, belongs to the technical field of ceramics, and solves the problem of non-uniform material dispersion caused by a preparation method in the prior art. The method comprises the following steps: uniformly dissolving a hyperbranched polyborosilazane precursor containing a silicon-hydrogen bond and poly (diacetylene) dimethylsilane containing alkynyl in anhydrous tetrahydrofuran according to a mass ratio of (5-20): 1, adding a catalyst platinum (0)-1, 3-diethylene-1, 1, 3, 3-tetramethyldisiloxane, reacting at 45-60 DEG C overnight, removing anhydrous tetrahydrofuran, and carrying out vacuum drying to obtain the hyperbranched polyborosilazane polymer. A polymer precursor is obtained; and thermally crosslinking the polymer precursor at 400 DEG C, grinding into powder, pressing into a blank, and pyrolyzing at 1400 DEG C to obtain the polymer converted wave-absorbing ceramic. According to the preparation method provided by the invention, two kinds of polysilane are uniformly mixed and cross-linked from a molecular level to obtain a new polymer precursor, and the wave-absorbing ceramic with uniformly dispersed structural components is prepared through high-temperature pyrolysis, so that a more stable effect is achieved.

The invention discloses a diacetylene topological chemical reaction method which comprises the following steps: spin-coating a diacetylene solution on a substrate to form a coating film; and irradiating the coating film by adopting an infrared light source, and reacting to generate polydiacetylene. Compared with side reaction and degradation caused by the fact that high-energy rays enable the material to enter an electron excitation state and material fragmentation caused by severe spatial change of molecules under high polymerization, mid-infrared light vibration excitation in the method serves as a means capable of triggering molecular vibration under an electron ground state, and under the mild condition, the mid-infrared light can be used as a means capable of triggering molecular vibration under the electron ground state. Therefore, various bad effects generated in the electron excitation state can be avoided.

The application discloses a kind of crosslinking strategy construction polymer conversion wave-absorbing ceramic and its preparation method and application, belong to ceramic technical field, solve the problem of uneven dispersion of material caused by the preparation method in the prior art.The method comprises the following steps: the hyperbranched polyborosilazane precursor containing silicon-hydrogen bond and poly(diacetylene) dimethylsilane containing alkyne group are uniformly dissolved in anhydrous tetrahydrofuran according to the mass ratio of 5-20:1, platinum (0) -1,3-divinyl-1,1,3,3-tetramethyldisiloxane is added, and the anhydrous tetrahydrofuran is removed after overnight reaction at 45-60℃ temperature condition, to obtain a polymer precursor;The polymer precursor is crosslinked at 400℃, ground into powder, pressed into embryo and pyrolyzed at 1400℃, to obtain a polymer conversion wave-absorbing ceramic.The preparation method provided by the application uniformly mixes and crosslinks two kinds of polysilane at the molecular level to obtain a new polymer precursor, and pyrolyzes at high temperature to prepare a wave-absorbing ceramic with uniform dispersion of structural components, achieving a more stable effect.

The invention relates to an active oxygen degradable polydiacetylene prodrug as well as preparation and application thereof, and belongs to the technical field of medicines. By utilizing the unique property that a main chain of a polydiacetylene polymer is completely broken into carboxyl-containing small molecules when the active oxygen level is increased, a carboxyl-containing drug is used as a raw material to construct a polydiacetylene prodrug, so that long-acting on-demand drug release of active oxygen response is realized. According to the prodrug, active oxygen is utilized to trigger a conjugated main chain to break so as to release an active drug, and meanwhile, a biocompatible small molecule by-product is generated. According to the polydiacetylene polymer side chain covalent connection medicine carrying system, the phenomenon of burst release of the medicine is effectively avoided, continuous administration as long as several months is achieved, and the polydiacetylene polymer side chain covalent connection medicine carrying system has high focus site selectivity and extremely low systemic toxicity. The active oxygen responsive degradation process and drug release cooperate to play a therapeutic role, and a negative feedback regulation drug release loop is formed, so that excessive administration and whole body exposure are avoided, on-demand remodeling of a microenvironment is realized, and the therapeutic effect is improved.

The invention belongs to the field of food packaging and food detection, and particularly relates to a method for preparing an amine response type nanofiber indicating film through electrostatic spinning and application of the amine response type nanofiber indicating film to food freshness detection. The method comprises the following steps that polycaprolactone serves as a film forming base material, polydiacetylene serves as an indicator, polyacrylic acid serves as an auxiliary agent, and the amine response type nanofiber indicating film is prepared through electrostatic spinning; the preparation method comprises the following steps: preparing a nanofiber membrane by adopting an electrostatic spinning technology, and preparing an amine response type nanofiber indication membrane through irradiation of an ultraviolet lamp; the prepared amine response type nanofiber indicating film has good biological safety and mechanical performance, the indicating film added with polydiacetylene and polyacrylic acid can generate obvious color change on low-concentration biogenic amine, and the freshness change condition of meat food such as shrimps in the transportation and storage period can be effectively indicated. The intelligent food freshness indicating film prepared by the method has wide application value in the field of intelligent food packaging.

The present disclosure relates to a polydiacetylene-based compound for detecting cyanide ions, a composition including the same, and a chemical sensor, and more particularly, to a polydiacetylene-based compound, which is a polymer of a self-assembly of diacetylene monomers represented by the following Chemical Formulas 1 and 2, a composition including the same, and a chemical sensor.(Chemical Formulas 1 and 2 are as defined in claim 1.)

The present invention discloses a high-temperature-resistant, temperature-sensitive composite nanofiber membrane, its preparation method, and application. The thermosensitive composite nanofiber membrane is an electrospun polydiacetylene / polyarylethernitrile composite nanofiber membrane. It undergoes a cross-linking reaction upon ultraviolet irradiation, changing its apparent color to blue. It then turns red at temperatures of 60°C or above and can withstand temperatures up to 170°C without shrinking. The high-temperature-resistant, temperature-sensitive composite nanofiber membrane prepared by the present invention not only exhibits high heat resistance but can also detect alkaline solutions. Therefore, it has broad application prospects in the fields of high-temperature detection and detection of alkaline environments.

An aminochalcone-diacetylene compound of Formula 1A:wherein R1 and R2 are independently selected from H and C1-C3 alkyl, A denotes a linkage connecting the chalcone and diacetylene units, m and n are independently integers in the range of 2 to 18, and the corresponding protonated form / ammonium salt of Formula 1B:wherein X is a counter anion. The disclosure further discloses the corresponding chromatic polydiacetylenes and polydiacetylenes-based sensors for detecting ammonia.

The application provides a piezochromic grounding shielding assembly for a plant protection unmanned aerial vehicle peristaltic pump and a monitoring method thereof, and relates to the technical field of unmanned aerial vehicles. The shielding assembly comprises a multilayer composite structure of a conductive metal substrate layer, a piezochromic functional layer, a transparent conductive protective layer and an anti-corrosion sealing layer. The piezochromic functional layer adopts a polydiacetylene-silver nanowire composite system and undergoes reversible blue-red phase transition under the action of grounding contact pressure. The monitoring method comprises the following steps: periodically collecting images of the color-changing area by an onboard miniature CMOS camera, extracting chromaticity parameters in the CIE Lab color space, establishing a chromaticity-grounding impedance mapping model, realizing four-level grading evaluation of grounding quality, and reporting in real time to a ground station through a flight control system. The application simultaneously provides passive visual indication and active digital monitoring dual functions without increasing the wiring and power supply burden, and significantly improves the reliability and maintainability of the shielding system of the plant protection unmanned aerial vehicle peristaltic pump.

The application discloses a method for diacetylene topological chemical reaction, which comprises the following steps: spin-coating a diacetylene solution on a substrate to form a coating film; and irradiating the coating film with an infrared light source to generate polydiacetylene through reaction. Compared with the side reactions and degradation caused by high-energy rays which make materials enter an electronic excited state, and the material fragmentation caused by the violent spatial change of molecules under high polymerization, the mid-infrared light vibration excitation in the method can be used as a means for initiating the vibration of molecules in an electronic ground state, and can be more widely close to a potential energy surface under mild conditions, so that various adverse effects generated in the electronic excited state can be avoided.

The invention discloses an irreversible thermochromic polydiacetylene material and application of the irreversible thermochromic polydiacetylene material in thermal runaway monitoring, and the irreversible thermochromic polydiacetylene material is prepared by the following steps: a) carrying out amidation coupling on 10, 12-25 carbon diyne acyl chloride and diaminopyridine to obtain bis (10, 12-25 carbon diyne) amidopyridine; and b) taking di (10, 12-25 carbon diyne) amidopyridine as a monomer, and carrying out ultraviolet irradiation in-situ topological polymerization to obtain the polydiacetylene material. The polydiacetylene material disclosed by the invention has irreversible thermochromism performance, is blue at room temperature, and can generate irreversible red purple or orange red conversion after being heated to 60-90 DEG C, that is, the material can still keep red purple or orange red after being cooled to room temperature. The polydiacetylene material can be used in the fields of temperature indication, transient thermal runaway monitoring and the like.

This disclosure provides a multilayer electronic component. The multilayer electronic component includes: a capacitor comprising a ceramic body and an outer electrode, the ceramic body including alternating dielectric layers and inner electrodes with the dielectric layers intermediate between the inner electrodes, the outer electrode disposed on the ceramic body and connected to the inner electrodes; and an organic layer configured to cover at least a portion of the outer surface of the capacitor and comprising a crosslinked polymer, the crosslinked polymer comprising at least one selected from the group consisting of polyacetylene polymers and polystyrene polymers, wherein the crosslinked polymer may have functional groups, the functional groups comprising one or more selected from the group consisting of silyl groups, phosphate groups, thiol groups, carboxyl groups, and isocyanate groups.

A multilayer electronic component comprises a capacitor including a ceramic body including a dielectric layer and internal electrodes alternately disposed with the dielectric layer interposed therebetween, and an external electrode disposed on the ceramic body and connected to the internal electrodes, and an organic layer disposed to cover at least a portion of an external surface of the capacitor and including a cross-linked polymer including one or more of a polydiacetylene-based polymer and a polystyrene-based polymer, wherein the cross-linked polymer may have a functional group including one or more of a silane group, a phosphoric acid group, a thiol group, a carboxyl group, and an isocyanate group.